When all insects hatch they have to break free from their larval or nymphal exoskeleton or "shuck". Some of the hatching insects don't clear their shucks or they take a bit of time to get free of it, leaving them stuck at at the water's surface. Often trout will get picky and target just the bugs with a "trailing shuck". This fly represents an emerging caddis that is still attached to its shuck and it is the one to have under these circumstances. The Trailing Shuck Caddis can make all the difference in the world during some caddis hatches. Available in sizes 14, 16 & 18.